video. feeds. a critical nuclear situation in japan it goes from bad to worse the sudden spike in radiation levels mean the drop from the stricken cooper she wrote. while the japanese government insists there's no immediate danger of a questionable track record of telling the truth about passing nuclear problems means that not everyone. is here in our city government forces in libya taking ever more ground from almost world powers are against imposing

a no fly zone of a country and still poised to discuss. conditions was the world's left with questions over the future of nuclear power he spoke to nuclear physicist walt patterson who shared his thoughts on what we can learn from what's been happening in asia possession and it's coming your way next. today i'm talking to robert patterson he's an associate fellow at chatham house and also the or fellow of a book on the power industry called keeping the lights on well thank you very much for talking now the situation in japan is we've seen several explosions at fukushima nuclear power plant what do you think the chances are that we may see more and the situation carrying on i'm sure that the people working on the site hope that they've got it under control but they seem to be releasing an awful lot

of hydrogen from at least three reactors and now from a fuel point as well and hydrogen is an explosive gas if it's confined mixed with air it produces it can produce very dramatic explosions as we've seen so that's clearly a. major concern for them but i think the explosion problem is almost the least of their problems at the moment because what it has done to the reactors we don't know we don't know who hasn't apparently damaged the containment or the reactor pressure vessels themselves although i gather there may be a hole in one of the containment and at unit two but what bothers me and i haven't heard any very good confirmation about it is what it has done to the actual contact between the temporal room and the reactor itself whether the whether the dials and gauges in the control room are now actually giving reliable information

about what's happening inside the reactors particularly because the sensors for temperature and pressure and water level and so on in the turbulent conditions that have been happening in those reactors must be the sensors must themselves now be potentially unreliable which means that the engineers in the control room don't actually know what's going on in the reactors and what could be going on in those reactors and yours. the problem is that they may have water levels rising and falling they may have fuel exposed they we know that they have had fuel exposed which has produced the reaction the reaction between the the molten metal cladding and the water that reduces the hydrogen so they've they've certainly had some fuel damage they may well have fuel ceramic fuel pellets that are now also circulating through the core and that will be clogging up channels and generally generally changing the configuration the geometry in the core and unless they're reacting

unless the reactor engineers know what is going on they're liable to do something wrong they're liable to do the wrong thing that's what happened with the acts of the three mile island in the united states that the engine engineers who thought they were doing the right thing to protect to protect the core. open valves when they should have closed them and vice versa and wonderful exposing the core and causing a major meltdown and you've mentioned that regulating in rug in reactor number two africa seen away stating we know that they were state that need for a period of time how dangerous that well the rich the fuel fill elements when they're running in the reactor with a chain reaction running the build up of radioactive waste in the fuel rods themselves gradually accumulates quite a sizeable infantry of very hot radioactive waste and when they do talk about the reactors all shutting down at the time of the earthquake which means that they shut down the chain reaction but you cannot shut down the radioactive waste and anything

up to ten percent of the heat in the reactor core when it's when it's when it's running comes from the radioactive waste not from the chain reaction you can shut down the heat from the waste and that he means that you have to keep taking the heat away or the temperature of the fuel rods goes up very fast and what has happened in i think all three units now is that the fuel has been at least partly exposed such that it then allows its own temperature to go up until the metal tubes melt. and the metal cubes melt and the little fuel pellets what are it's like little sweetie's fall fall down the uranium fall falls down into into the water and of course the problem that produces is that if enough of them fall together they can start up a chain reaction again and despite all this and what you're talking about a sort of self-perpetuating scenario the government in japan to thank thank for that with the fire has nothing to do with the worry about do you think that telling

the whole tree i'm not sure they know the whole truth that's part of the problem i mean in the circumstance it would be bad enough if it were normal times with this is after an earthquake and an enormous tsunami and the communication channels and the normal organization even of a society as organized as japan has taken a terrible hit so the fact that they're now faced with a problem like the nuclear problem or they already have more on their hands that anybody could possibly imagine with that with the earthquake and the aftermath of the tsunami but if it's brutally brutally difficult for the for the both for the government and for the people of japan and the rest of the world we always say that pattern has a reputation as one of the world's most technologically advanced countries and yet they've been struggling to call these react without for days now what are the factors that play that thing well i think one of the factors is that precisely the fact that the that this is a nuclear power is a very very complicated technology and its track record of actually dealing with

some of the implications of the of the the inherent the inherent characteristics of this work of this type of reactor is not good i found last night an article that i wrote nearly forty years ago describing an intense controversy in the united states for both the performance precisely of the so-called emergency cooling systems on water cooled reactors and the performance was criticized by independent experts in the us but then nuclear establishment the us atomic energy commission we've the concerns aside and this was at the time when fukushima alone was being built. and the same the same problem is inherent in this kind of reactor the only kind of reactor that anybody is building now anywhere in the world these reactors were originally built as power plants for submarines and

obviously the overall the overriding design criterion is that it has to be compact enough to fit inside the hell of a summary and that means that it has to produce an enormous amount of heat in a very small wall you and the only way that it can do that is with very very high pressure water which means in turn that the walls of the reactor the boiler the reactor pressure vessel have to be twenty centimeters thick and this poses all kinds of safety problems if there is any possibility of the pressure being lost or even worse if the pressure vessel itself might happen to be breached and these are the problems that these engineers are now trying to cope with in japan some commentators on that back starting to look a lot like singapore what do you think about that i hope that we're still going to be a long way short of a trip of a chernobyl here particularly for one reason that even if there were

a major release of radioactivity from one or more of the reactors the the event to chernobyl was accompanied by an enormous fire which produced a huge plume of thought air carrying radioactivity right up into the stratosphere. and that radioactivity was then carried all over the planet by stratospheric wins i think but i can't think of a mechanism that would distribute radioactivity on that kind of scale from anything that could possibly happen at fukushima but we have heard that they have already had some fires including a fire in a fuel pond when which the cooling apparently failed and any kind of any kind of heat source like that will at least produced some kind of updraft to lift some radioactivity of some kind into the into the upper atmosphere into the into into the wind where it can be carried some distance and of you know love the fact that

plane whether that's a fire in which direction the wind blows the lid but what's the what are the chances that a radioactive cloud could reach russia from japan. i think very low i think very low for one thing the prevailing wind is not in that direction and for another thing as i say i can't think of a mechanism that would lift a significant amount of radioactivity high enough for it to travel that kind of distance so i don't think i don't think there's any any reason for concern. for russia or for north america for that reason japan is very unstable geographically in terms of that great and yes i would definitely have chosen to build a little nuclear power face and face because of the power supply or nuclear energy do you think this will change the attitude to nuclear power in japan i think it is down to there have been of course there's been quite a substantial body of opinion in japan including among sees mala just that building

nuclear plants anywhere in japan is not a good idea my personal feeling is that building nuclear plants anywhere is not a good idea for basically economic reasons they're very expensive they tend to be unreliable they are a kind of electricity which is very inflexible and difficult for an electricity system to use because you can lose a thousand megawatts in two minutes and one way in another i have never been persuaded that the economic case for nuclear power is especially convincing and in recent years of course that has been the major controversy about nuclear power investment all over the world private investors do not want to spend money on nuclear plants for quite understandable reasons they don't think they could get their money back but now the safety issue has come back again and that we're complicate things even further and of course we haven't had a big nuclear accident really since general right from nine hundred eighty six so that people love to be receiving that nuclear power is becoming safe well well

actually it's partly that but i think a much more important factor is that until quite recently nobody has built a new nuclear plants not in the west there have been no. no nuclear plants ordered in the us for example some state hundred seventy eight and since night and every plate ordered since one thousand nine hundred seventy four has been canceled up until the last couple of years when there is suddenly begun to be an great deal of u.s. government taxpayers' money on offer as subsidies for construction of new nuclear plants and even that is not persuading the companies in the us to build them so the the reason that people have not been objecting to nuclear power her past twenty years is that nobody has been building them so now you're going to get a situation which i think mit might turn into a rerun of the kind of controversies of the first generation of nuclear plants in the late sixty's and seventy's when the public was the really unhappy about a lot of these plans and we may well find that happens again i thank you very much

. sports is political in ways we don't often even notice especially on the level of culture where our ideas and attitudes as a society are shaped. when it. comes to the ties between professional football and the u.s. military have existed since the start of the n.f.l. back in one thousand scrawny that relationship her immensely during world war two and today that is stronger than ever. your intention is to kill all in all it all feel pressure until you feel a little bit of recent history has taught us the sports is never just something that we just sit back and mock the sports always had an important social function

and the history of american sports is no different. from. download the official autopsy on placation job on the phone on called touch from the i choose option. which all she lives on the go. video on demand are keys mind bold colors and speech now in the palm of your. question. if. any is complete it's. the.

hunger for the full story we've got it's. the biggest issue. get the cuban voice face to face with the news makers on. their headlights or on our t.v. and a critical nuclear situation in japan goes from bad to worse it's a sudden spike in radiation levels to suspend most of the emergency operations of the stricken fukushima power plant. and while the japanese government insists there's no immediate danger a questionable track record of telling the truth about past nuclear problems means not everyone's convinced. you know the news government forces in libya are retaking evermore ground from the rebels most world powers are against imposing a no fly zone above the country and the u.n. is still set to discuss. across a lot of sports andrew is here now and i defy you to i trust that your love it's

clothing today you're wearing a pair of trunks so you assume because you have news about cliff diving yeah usually cliff diving i'm not wearing the trunks there is a russian called. making a name for myself in this sport which is relatively new at the moment so we look at his latest event from chile and i can tell you the pictures are spectacular and of course we're talking about the champions league football to all that and i. hello there thanks for watching the sport and this is what is coming out. fighting for survival defending champions stay in the cage a victory over style over. a month united and into reach the champions league quarter finals with narrow winds. and daring ambition we made a russian is taking cliff diving to new heart. that start with the continental

league playoffs hockey league playoffs the defending champion. hanging in there beating sound about your life for nearly new for to maintain a slim hopes of reaching the last four having lost their three games in this best of seven series back to win survivor nickel cap and got the first goal in the opening period and two more followed in the second elects motors of doubling cell about sleepy before myself those that made it rain it. and to cap it dominating performance young person in the fall from the front so right now the one down they still have to win all the remaining matches to reach the last ball. so confirmation of that one them while it's all square and the other contest regular season champions and on guard tied that series it's clear to see that a hard fought three two win over met in the. champions league in milan and manchester united have made it through to the quarter finals in buying munich

respectively on tuesday night into the defending champions squeezing past time with a goran pandev goal four minutes from time and made it through two on the night in three three on aggregate meaning into go through to the last eight on away goals and the other time i watched united overcame our say to win an old trafford after goal was still in front of your hands as scored twice in manchester and inquired praise from boss sir alex ferguson. i think graf surprised i think we're broke. sometime true just forced a war in the courtroom. this isn't a substitute. names you claim or you win a few games for us. is adjusted to the physical part really well and is worse than the humans who are all the. butts going to school options well tonight chelsea have

a great chance of making friday's quarter final draw they take on copenhagen at stamford bridge with a two goal cushion from the first leg nicolas anelka has price in denmark giving them some daylight but please manager call them into law he says he won't be taking his opponents copenhagen lightly even though they've never won in england in this tournament. was. very important one. quarter final all the time because luke would be appropriate over pension plan are going to use a good team. but we're going to. really use. this time through to broker a world that the interesting for. well despite what he says many people to think their businesses have little chance in london tonight because they can manage just. says the tie is far from over and could be decided by whoever score spurts yet again tonight on the grid take only on at the burn about

the team's three one one in the first leg from reality hoping for some revenge having been knocked out by leon at this stage last year and in fact they've been dumped out of the last sixteen in this competition for the last six seasons but costco's in rio says both sides will be feeling the pressure. of a single pressure applied competition to this not all competition everybody knows that. after the match one team goes through another team goes home. everybody knows that. the next rounds one team will play another team we watch on t.v. and that's the the pressure that applies to these. two does not go out. eventually now on thursday to the mosque i was any and spot at mosque i will be in action in the year rightfully but not all of them have the best of starts in the opening weekend of the new russian primate league season a quick look back at that mat what happened at ace.

thanks. it's past that we'll have to do better against i.x. tomorrow let's catch up with the tennis at indian wells where some big names have fall in their first in the u.s. open champion complies disease out forced retire from her fourth round tie with a shoulder injury the belgian won the first set against bartoli of france six three but then had to stop the world number two saying she had trouble with the shoulder before and will now travel to miami ahead of next week's treat. also does the defending champion really yankovic the serve losing to compacted and the revenge of each six four six team that is the seventh ten meters and the ninety ninth place by the finals and i was the only surprise five sees francesca schiavone lost in three sets to hear from israel the world number one most of that speech is due to the courses she didn't have to survive a mini scared against russian police it could have been of great surprises in the

men's draw roger federer beating chile's one internationally chile with a i taking the first step to love and going on to take the second six two. also means before france djokovic he had an even more convincing win against latvian in the school of six love six one to score in that. and we finish with one of the nearest and most exciting extreme sports it is called cliff diving it is just play with ten years old and this one russian is already established his name in the sport is rubbish but then you expect. breast taking this is clique guarding the really extreme where a human being and nature become one. it's one of the news sports in the planet

as it became competitive only two thousand following hell why and work tradition which is a would do under the years old and rochelle already has a clean driver to be proud of. the twenty six year old days of his first victory at the red bull world series in august last year and entered this isn't as the favorite along with nine time will gent then all under due care and last season's winner gary hands one of the world's most isolated and mystical places revenue we all and is choose most whistle point and they keep venue for the twenty eleven world series and the reigning champ and was the first in children and impressive died so which was only now to secure the place on the day if the next step on the platform sutra into choosing the is currently one of the most complicated does it they do off the russian feet if but if wooden enough to

work on the colombian grandmaster please don't have a big history moment with just flow as if really happy really proud i think. it paid off the training i did in the offseason my my dad's are feeling pretty comfortable. that was my plan to improve on the existing dives and maybe workers and you know i've so far as working good help in maintaining for the rest of the season however a solution that claims to have what it takes to be diligent i'd take second place in this competition and this is just this season revoke are very careful long season you surprise near zero. those are going forward but i hope more fills. i'm so so it's good stuff from us and we clearly need a few more dice to keep in the memory well looking forward to know that cleaver having events at the next stage of the world series will be held in mexico in the temple april roberts well known r.t.

. right pictures good luck to matt is elizabeth and i'm. cultures that so much definitely a huge musician apparently trying to market the arab world power of people's hopes and the deadly reactions of a tyrant or tunisia and egypt leading the way for our libya.

for the full story we've got it from. the biggest issues get a human voice face to face with the news makers on the potty. download the official ante up the condition i phone or i pod touch from the i choose apps to. cianci life on the go. video on demand parties mind becomes an r.s.s. feeds now in the palm of your.